Combined switch device and centrifugally operable actuator therefor



Dec. 2. 1969 E P. LAR'SH 3,482,068

COMBINED SWITCH DEVI CE AND CENTRIFUGALLY OPERABLE ACTUATOR THEREFORFiled Oct. 12, 1967 5 Sheets-Sheet 1 INVENTOR EVERETT P. LARSH "mm fla 1ATTORNEY Dec. 2. 1969 p LARSH 3,482,068

COMBINED SWITCH DEVICE AND CENTRIFUGALLY OPERABLE ACTUATOR THEREFORFiled 12, 1967 Sheets-Sheet 2 60 I oa 48 oa Ill 6 lllll INVENTOR EVERETTP. LARSH "mm %M A TTO/PNE' Y 3,482,068 BLE Dec. 2. 1969 E. P. LARSHCOMBINED SWITCH DEVICE AND CENTRIFUGALLY OPERA ACTUATOR THEREFOR 3Sheets-Sheet 5 Filed Oct. 12, 1967 R V: M %M N R Wm m T W fiA P. T T E RWm 9 w G Y a m m 4 H United States Patent US. Cl. 200-80 14 ClaimsABSTRACT OF THE DISCLOSURE The combination of an electric switch deviceand a centrifugally operable actuator therefor. The switch and actuatorunit is particularly adapted for use with an electric motor which isprovided with a starting winding or the like. The switch and theactuator therefor are combined as a unit for mounting within a frame orend bell of an electric motor or the like.

BACKGROUND OF THE INVENTION The subject matter of this applicationconstitutes an improvement over the structure disclosed in my PatentsNo. 3,058,355, No. 3,194,078, and No. 3,293,398.

It is customary in some types of electric motors to provide a startingwinding which is used only in the starting of the motor. In the startingof the motor, after the rate of rotation of the motor rotor reaches agiven value, means are provided for de-energization of the startingwinding. In the past, the means for de-energization has usually includeda switch device which has been mounted in the motor frame or end bell ofthe motor and an actuator device which has been mounted on the shaft ofthe rotor. It is necessary to mount the switch device and the actuatordevice in precise relative positions in order to obtain accuracy inoperation of the switch.

However, it has been found very difficult and/or time consuming tosecure the switch device to the housing or end bell and to secure theactuator device to the shaft so that the switch is operated at a desiredpredetermined rate of rotation of the shaft. For example, unless theswitch device and the actuator device are mounted very carefully indesired relative positions, the switch may be operated by the actuatordevice at a rate of rotation of the shaft which is less than or greaterthan the rate of rotation which is desired for operation of the switch.Such improper operation of the switch is, of course, objectionable orundesirable.

Another condition which adds to the problem involved in the mounting ofsuch devices is that a motor shaft is usually supported in a manner topermit limited axial movement thereof. Therefore, if an actuator deviceis secured to the shaft, the actuator device moves axially with axialmovement of the shaft. Such axial movement of the actuator device mayresult in movement thereof to a position with respect to the switchdevice so that the switch device is not operated when the predeterminedrate of rotation of the shaft occurs.

Thus, it is an object of this invention to provide a combined switch andactuator unit in which the desired space relationship between theactuator and the switch is always maintained. Thus, maximum accuracy andprecision of operation of the switch is maintained.

It is another object of this invention to provide such a switch andactuator unit which can be easily installed or mounted in operatingposition.

Other objects and advantages reside in the construction of theinvention, combinations thereof, the method Patented Dec. 2, 1969 ofmanufacture, and the mode of operation, as will become more apparentfrom the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is an exploded perspectiveview of a switch and actuator unit of this invention.

FIGURE 2 is an enlarged side sectional view, with parts broken away, ofthe switch and actuator unit of FIGURE 1. FIGURE 2 shows the elements ofthe unit in the normal positions thereof.

FIGURE 3 is an enlarged side sectional view, with parts broken away,similar to FIGURE 2, showing the elements of the unit in the actuatedposition thereof.

FIGURE 4 is a bottom elevational view, drawn on a smaller scale thanFIGURES 2 and 3, showing the elements of the unit in the positionsthereof shown in FIGURE 2.

FIGURE 5 is a bottom elevational view drawn on substantially the samescale as FIGURE 4 showing the elements of the unit in the positionsthereof shown in FIGURE 3.

FIGURE 6 is a sectional view, taken substantially on line 66 of FIGURE4.

FIGURE 7 is a perspective view of another switch and actuator unit ofthis invention.

FIGURE 8 is an enlarged side elevational view of the unit shown inFIGURE 7.

FIGURE 9 is a sectional view, taken substantially on line 99 of FIGURE8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A switch and actuatorunit of this invention may be mounted within an end bell or housing ofan electric motor. However, a unit of this invention may also be usedwith other apparatus and may be mounted at or in any suitable portionthereof. The unit shown in FIGURES 1-6 comprises an engagement member orconnector member 10 which is adapted to be attached to a suitablesupport member 12. The support member 12 may be any stationary element,such as a portion of a motor housing or an end bell or the like, notshown.

The engagement member 10 is adapted to be positioned adjacent a rotaryshaft 16. The shaft 16 is shown as having one or more keys or keyportions 20. Each of the keys or key portions 20 is disposed within akey slot 24 of an inner sleeve or inner rotor 22 which encompasses theshaft 16. The inner rotor or sleeve 22 is freely axially movable wtihrespect to the shaft 16 as each key 20 fits freely Within its respectiveslot 24.

The inner rotor or sleeve 22 is provided with an annular groove 28 whichslidably receives an engagement portion 30 of the engagement member 10.Preferably, the engagement portion 30 has parts within the annulargroove 28 at diametrically opposite portions of the rotor 22. Theportion 30 is shown as being arcuate and extends around more thanone-half the periphery of the inner rotor 22 so that the engagementmember 10 is attached to the inner rotor 22 while permitting relativerotative movement therebetween. The portion 30 of the engagement member10 may be slightly resilient. Thus, when the portion 30 is arcuate andextends around more than one-half the periphery of the rotor 22, theengagement member 10 may be connected to the rotor 22 by forced snapaction or the like, as the portion 30 resiliently increases in dimensionmomentarily to receive the rotor 22.

A carrier member 36 encompasses the inner rotor 22 and is attachedthereto by means of a collar 38 which is secured to a reduced diameterend portion 39 of the inner rotor 22. The carrier member 36 has aradially extending face portion 40 which terminates in a peripheralaxially extending flange portion 42. At the juncture between the faceportion 40 and the flange portion 42 is a plurality of protuberant pivotportions 44, shown in FIGURES 1-5 which may be provided in any suitablemanner. Herein, the pivot portions 44 are formed by indentations in theface portion 40. The face portion 40 has a plurality of openings orwindows 45 therein, each of which is adjacent one of the pivot portions44.

Freely encompassing the inner rotor or sleeve 22 is an outer rotor orouter sleeve 46. The outer rotor or outer sleeve 46 has a radiallyextending engagement disc 48. Adjacent the disc 48, the outer rotor 46has a plurality of spring seat portions 50. The spring seat portions 50are disposed in pairs around the periphery of the outer rotor or sleeve46. Intermediate each pair of spring seat portions 50, but spaced fromthe disc 48, is a protruding cam portion 52. Thus, there is a pluralityof cam portions 52.

Each pair of spring seat portions 50 and the cam porton 52 disposedtherebetween form a group of protuberances on the periphery of the outersleevce 46, as shown in FIGURE 1. Each such group of protuberances 50and 52 is adjacent an opening 45 in the face portion 40 of the carriermember 36.

The outer sleeve or rotor 46 has an inwardly extending rim 56, shown inFIGURE 2, which is normally in engagement with a shoulder 58 of theinner sleeve or rotor 22, shown in FIGURES 1, 2, and 3.

A plurality of actuator members 60 is carried by the inner rotor 22 andby the outer rotor 46. Each actuator member 60 includes a weight portion62, a base portion 64, and a lever portion 65. The weight portion 62 ofeach actuator member 60 is adapted to be disposed within one of theopenings 45 of the face portion 40 of the carrier member 36. The leverportion 65 of each actuator member 60 is in engagement with one of thecam portions 52 of the outer rotor 46.

Each actuator member 60 also includes a resilient arm 68. The resilientarm 68 may consist of any suitable member such as one or more springwire members. A central portion of each resilient arm 68 is firmlyattached to a base portion 64. The resilient arm 68 has a V-shapedengagement portion 70, which extends therefrom as shown in FIGURE 1. TheV-shaped portion 70 engagingly straddles one of the pivot portions 44 ofthe carrier member 36, as illustrated in FIGURES 2 and 3. Thus, theengagement portion 70 of each actuator member 60 is pivotal about one ofthe pivot portions 44.

The resilient arm 68 of each actuator member 60 is shown as having apair of laterally extending loop portions 72 at opposed parts of thebase 64. The opposite ends of each resilient arm 68 are seated in one ofthe pairs of spring seat portions 50. Thus, each resilient arm 68 is incompression and pivotal about a pair of the spring seat portions 50, aswell as being pivotal about one of the pivot portions 44 of the carriermember 36, as shown in FIGURES 2 and 3. The actuator members 60 thusjoin the inner rotor 22 to the outer rotor 46 for rotation one with theother.

Each resilient arm 68 normally urges the outer rotor 46 and the innerrotor 22 in opposed axial directions. However, the inwardly extendingrim 56 of the outer rotor 46 normally engages the shoulder 58 of theinner rotor 22 and limits the relative axial movement between the outerrotor 46 and the inner rotor 22, as shown in FIGURE 2.

A bracket member 80 is attached to the engagement member by any suitablemeans, such as by pins 82 shown in FIGURES l, 2, and 3. The bracketmember 80 has a first end portion 80a and a second end portion 80b, asshown in FIGURE 1. The bracket member 80 supports an electrical switchmechanism 84 which extends between th end Por ions 8041 nd 89 Th sw ch mchanism 84 may be any suitable electrical switch mechanism but ispreferably a switch mechanism made according to the invention disclosedin my Patent No. 3,293,398.

The switch mechanism 84 includesa resilient stem 90 which is attached tothe end portion b of the bracket 80 and extends to a position adjacentthe end portion 80b. A connection lug 89 is attached to the stemadjacent the end portion 80a of the bracket 80. The stem 90 has acontact carrier portion 90a which carries an electrical contact 91. Theend portion 80b of the bracket 80 supports an electrical contact 92adjacent the electrical contact 91. The electrical contact 91 isengageable with the electrical contact 92 with bending action of thestem 90. The contact 92 has attached thereto a connection lug 93.

The end portion 80b of the bracket 80 has an extending abutment member94 which is engageable by the end of the stem 90 for limiting thebending movement thereof in a direction from the contact 92.

A U-shaped resilient leg 96 has a portion thereof attached to the stem90. The resilent leg 96 has an end portion 96a engageable with a tab 98which extends from the contact carrier portion 90a of the stem 90. Theresilient leg 96 carries a pressure button 99 which is engageable by thedisc 48 for bending movement of the resilient leg 96.

OPERATION The engagement member 10, with its portion 30 disposed withinthe annular groove 28 of the inner sleeve 22, retains the inner rotor 22in a given position with respect to the support structure 12 and withrespect to the switch mechanism 84.

When the shaft 16 is not rotating or is rotating at a rate less than agiven rate, the elements of the apparatus are in the relative positionsthereof shown in FIGURES 2 and 4. In such position, the resilient arms68 force the outer rotor 46 toward the annular groove 28 of the innersleeve 22, as shown in FIGURE 2. Such movement .of the outer rotor 46with respect to the inner rotor 22 is limited by the shoulder 58 of theinner rotor 22 which is engaged by the inwardly extending rim 56 of theouter rotor 46.

Such position of the outer rotor 46 with respect to the switch mechanism84 causes the disc 48 to engage the pressure button 99 which is carriedby the resilient leg 96, as shown in FIGURES 2 and 4. Therefore, theresilient leg 96 is bent toward the stem 90, and the stem 90 is benttoward the bracket 80. Thus, the electrical contact 91 which is attachedto the stem 90 is in engagement with the electrical contact 92, which isattached to the connection lug 93. Thus, an electrical circuit betweenthe lugs 89 and 93 is completed with engagement of the electricalcontact 91 with the electrical contact 92, as shown in FIGURE 4.

After rotary operation of the shaft 16 begins, the rate of rotationthereof rapidly increases. The inner rotor 22 which is attached to theshaft 16 by means of the keys 20 and the key slots 24 rotates with theshaft 16. The engagement portion 30 of the engagement member 10 which isdisposed within the annular groove 28 of the inner sleeve 22, retainsthe inner sleeve 22 against axial movement while permitting rotarymovement thereof. Due to the fact that the shaft 16 is axially movablewith respect to the inner rotor 22, any axial movement of the shaft 16which may occur during starting and during operation of the rotor towhich the shaft 16 is attached has no effect upon the operation of theapparatus. Thus, until the shaft 16 reaches a predetermined rate ofrotation, the electrical contacts 91 and 92 remain in firm engagement,one with the other, and maintain a circuit between the connection lugs89 and 93.

As the rate of rotation of the shaft 16 increases, the rotational rateof the inner rotor 22 and the outer rotor 46 increase therewith.Therefore, as the rate of rotation of the shaft 16 increases,centrifugal forces upon the weight portions 62 of the actuator members60 increase and the weight portions 62 of the actuator members 60 tendto move outwardly in a direction from the shaft 16. As the centrifugalforces upon each actuator member 60 increase, the weight portion 62thereof tends to pivotally move about an axis established by theengagement of the V-shaped engagement portion 70 of the actuator member60 with a pivot portion 44 of the carrier member 36.

As the rate of rotation of the shaft 16 and the rotors 22 and 46increases, a condition occurs in which the centrifugal forces actingupon the weight portions 62 overcome the resilient forces of theresilient arms 68. At the instant this condition occurs the weightportions 62 of the actuator members 60 move outwardly to a position asshown in FIGURES 3 and 5, as pivotal movement of each actuator member 60about its respective pivot portion 44 occurs.

As shown and discussed, the loop portions 72 of each resilient arm 68are seated in a pair of the seats 50 of the outer rotor 46. Therefore,as the actuator members 60 pivotally move, the resilient arms 68 thereofchange in the general angle thereof from the slope thereof shown inFIGURE 2 to a position slightly inclined from a line normal to the axisof rotation of the shaft 16, as shown in FIGURE 3. With this change inangle of the resilient arm 68, there is a change in the direction offorce of the resilient arms 68.

Due to the fact that the effective length dimension of each resilientarm 68 decreases only slightly as the angle thereof changes from thatshown in FIGURES 2 and 4 to that shown in FIGURES 3 and 5, the total oreffective resiliency of the resilient arms 68 increases only slightly asthe change in angle thereof occurs. Therefore, the change in angle orthe lever action of each resilient arm 68 in its movement from theposition thereof shown in FIGURE 2 to the position thereof shown inFIGURE 3, as the resilent arm 68 is seated in a seat 50, urges the outerrotor 46 toward the carrier member 36.

However, the greatest force urging movement of the outer rotor 46 towardthe carrier member 36 occurs from lever action of the actuator members60. When the weight portion 62 of each actuator member 60 movesoutwardly in a direction from the shaft 16, the base portion 64 and thelever portion 65 thereof move to the left as shown in FIGURE 3, aspivotal action occurs about the pivot portion 44. Such movement of thelever portion 65 causes the lever portion 65 to apply leverage action orforce upon the cam portion 52 of the outer rotor 46. This leverageaction or pressure urges the outer rotor 46 axially toward the carriermember 36. Thus, each actuator member 60 as it pivotally moves undercentrifugal forces, applies a lever action or force upon the outer rotor46 and urges the outer rotor 46 toward the carrier member 36.

Thus, there is relative axial movement between the outer rotor 46 andthe inner rotor 22. Due to the fact that the inner rotor 22 is retainedagainst axial movement by the engagement member 10, the outer rotor 46moves axially toward the carrier member 36, while the axial position ofthe inner rotor 22 does not change.

When the outer rotor 46 moves toward the carrier member 36 of the innerrotor 22, the engagement disc 48 of the outer rotor 46 moves in adirection away from the electric switch mechanism 84. Thus, theengagement disc 48 moves out of engagement with the pressure button 99which is carried by the resilient leg 96. Therefore, the upper portionof the stem 90 moves away from the bracket 80. Thus, the electriccontact 91 carried by the stem 90 is separated from the electric contact92 which is attached to the connection lug 93, as shown in FIG- URE 5.Thus, the circuit between the connection lug 89 and the connection lug93 is opened. Thus, operation of the actuator mechanism opens anycircuit within which the switch mechanism 84 is connected.

When the rate of rotation of the shaft 16 decreases below a given value,the centrifugal force upon the actuator members 60 decreases to such avalue that the force of the resilient members 68 overcomes thecentrifugal force upon the weight portions 62 and the actuator members60 pivotally move from the positions thereof shown in FIGURES 3 and 5 tothe positions thereof shown in FIGURES 2 and 4. Thus, the disc 48 of theouter rotor 46 moves into engagement with the pressure button 99 of theresilient leg 96 and moves the resilient leg 96 to the position thereofshown in FIGURE 4. Thus, the electrical contact 91 is again moved intoengagement with the electrical contact 92.

Due to the fact that the inner rotor 22 and the shaft 16 are relativelyaxially movable, any axial movement of the shaft 16 during rotationthereof does not affect the position of the inner rotor 22 or the outerrotor 46 with respect to the switch mechanism 84. Therefore, any axialmovement of the shaft 16 does not affect the operating conditions of theactuator members 60 and the disc 48 upon the switch mechanism 84.Furtherfore, the desired relative positions of the inner rotor 22, theouter rotor 46, and the switch mechanism 84 are fixed and are notaffected by the location of the support structure 12 to which theengagement member 10 is attached. Thus, installation of the electricswitch and actuator unit of this invention can be performed easily andreadily.

APPARATUS OF FIGURES 7-9 The apparatus of FIGURES 79 is similar to thatof FIGURES 16 except that an inner rotor 122 is secured to a shaft 116for rotation therewith and for axial movement therewith. The inner rotor122 has a carrier member 136, which is similar to the carrier member 36of FIG- URES l-6, attached thereto.

The inner rotor 122 is provided with an annular groove 128 within whicha portion of an engagement member or connector member is disposed. Theengagement member 110 is similar to the engagement member 10 discussedabove. The engagement member 110 has an axially extending stud 111secured thereto and disposed within an opening 113 of fixedly positionedstructure 112.

An outer rotor 146 encompasses the inner rotor 122 in a manner similarto that shown and discussed in regard to the inner rotor 22 and theouter rotor 46 of FIGURES 1-6. A plurality of actuator members aresimilar to the actuator members 60 of FIGURES l-6 and are joined to therotors 122 and 146 in the manner discussed above with respect to therotors 22 and 46 and the actuator members 60.

The actuator members 160 operate in a manner similar to that describedwith respect to the actuator members 60. Outward pivotal movement of theactuator members 160 causes relative axial movement between the outerrotor 146 and the inner rotor 122. The inner rotor 122, as stated aboveand as shown in FIGURES 7 and 9, is secured to the shaft 116. Thus, theouter rotor 146 moves axially upon the inner rotor 122 as the actuatormembers 160 pivotally move outwardly as a result of centrifugal forcesapplied thereto with rotative movement of the rotors 122 and 146. Theouter rotor 146 has an engagement disc 148 which, with axial m vement ofthe outer rotor 146, operates any suitable switch mechanism 184 which iscarried by the engagement member 110. Connector lugs 189 and 193 areattached to the switch mechanism for electrical connection thereto. Anysuitable flexible electrical conductor members may be attached to theconnector lugs 189 and 193.

Due to the fact that the inner rotor 122 is secured to the shaft 116,the inner rotor 122 is axially movable with any axial movement of theshaft 116. Such axial movement of the shaft 116 causes axial movement ofthe engagement member 110 which has a portion thereof disposed withinthe annular groove 128 of the inner rotor 122. The stud 111 which isfixed to the engagement member 110 has guided axial movement within theopening 113 of the structure 112 with axial movement of the engagementmember 110. Thus, any axial movement of the shaft 116 results in axialmovement of the switch mechanism 184 as well as axial movement of therotors 122 and 146. Thus, any axial movement of the shaft 116 does notdisturb the relationship between the outer rotor 146 and the switchmechanism 184 which is carried by the engagement member 110.

Preferably, the engagement member 110 encompasses slightly more thanone-half the periphery of the inner rotor 122 so that the engagementmember 110 is connected to the inner rotor 122, while permittingrelative rotary movement between the inner rotor 122 and the engagementmember 110.

Thus, the apparatus of this invention shown in FIG- URES 1-6 and inFIGURES 7-9 constitutes a unitary mechanism which includes switch meansand centrifugally operable actuator means therefor.

Although the preferred embodiment of the device has been described, itwill be understood that within the purview of this invention variouschanges may be made in the form, details, proportion and arrangement ofparts, the combination thereof and mode of operation, which generallystated consist in a device capable of carrying out the objects setforth, as disclosed and defined in the appended claims.

The invention having thus been described, the following is claimed:

1. Control apparatus responsive to rotary movement of a rotary drivemember, comprising:

an inner rotor, an outer rotor, the outer rotor being coaxial with theinner rotor and encompassing a portion of the inner rotor, the rotorsbeing relatively axially movable,

means for joining one of the rotors to a rotary drive member forrotation therewith while permitting relative axial movement between therotor and the rotary drive member,

a plurality of actuator members carried by the inner rotor and the outerrotor and joining the rotors one to the other, each actuator memberincluding a weight portion, each actuator member including resilientmeans urging relative axial movement between the rotors in a directionof one rotor from the other rotor, centrifugal forces resulting fromrotation of the rotors causing movement of the weight portions of theactuator members so that the actuator members urge relative axialmovement of the rotor members in a direction of one rotor toward theother rotor,

support structure engaging one of the rotors and limiting axial movementthereof while permitting rotary movement thereof,

switch mechanism carried by the support structure,

operator means carried by the rotor which is not engaged by the supportstructure, the operator means being engageable with the switch mechanismand movable with respect thereto for operation thereof.

2. The apparatus of claim 1 in which the support structure encompasses aportion of the said rotor which is engaged by the support structure sothat the support structure is connected to the said rotor while thesupport strucure and the said rotor are relatively rotatable.

3. Control apparatus responsive to rotary movement of a rotary drivemember, the control apparatus being of the type having a first rotor anda second rotor, the rotors being relatively axially movable, one of therotors being connected to the rotary drive member for rotationtherewith, actuator meansin engagement with each of the rotors andjoining the rotors together and normally urging relative axial movementin given directions between the rotors, the actuator means includingweight members which are movable in response to centrifugal forces tourge relative axial movement of the rotors in directions opposite tosaid given directions, the improvement comprising:

fixed support structure engaging the first rotor limiting axial movementthereof while permitting rotary movement thereof,

switch mechanism carried by the support structure,

the second rotor having an engagement portion which is engageable withthe switch mechanism and movable with movement of the second rotor foroperation of the switch mechanism.

4. The apparatus of claim 3 in which the fixed support structureencompasses a portion of the first rotor so that the fixed supportstructure is connected to the first rotor while permitting rotarymovement of the first rotor with respect to the support structure.

5. Control apparatus comprising:

a pair of coaxial relatively axially movable rotor members, there beinga first rotor member and a second rotor member,

centrifugally responsive actuator means joined to the rotor members forrelative axial movement between the rotor members upon operation of theactuator means as the rotor members rotate one with the other,

the first rotor member having a peripheral groove therein,

a connector member having a portion within the groove of the first rotormember and partially encompassing the first rotor member so that theconnector member and the first rotor member are joined one to the otherfor rotation of the first rotor member with respect to the connectormember,

switch means carried by the connector member,

the second rotor member having a portion movable with respect to theswitch means for operation thereof.

6. The apparatus of claim 5 in which the portion of the connector memberwhich is within the groove of the first rotor member encompasses morethan one-half of the rotor member.

7. The apparatus of claim 5 in which the connector member has portionswithin the groove of the first rotor at diametrically opposedspaced-apart positions of the peripheral groove of the first rotormember.

8. In combination, a rotary shaft, stationary support structure, andcontrol apparatus comprising:

a first rotary member encompassing the shaft and joined thereto forrotation therewith,

a second rotary member encompassing the first rotary member and axiallymovable with respect thereto,

centrifugally operable actuator means joined to the rotary members forrelative axial movement thereof,

connector means connecting the first rotary member to the stationarysupport structure and permitting rotation of the first rotary memberwith respect to the stationary support structure,

switch mechanism carried by the connector means,

the second rotary member including operator means for operation of theswitch means with axial movement of the second rotary member.

9. The combination of claim 8 in which the first rotary member issecured to the shaft for axial movement therewith.

10. The combination of claim 8 in which the connector means is securedto the stationary support structure.

11. The combination of claim 8 in which the connector means is axiallymovable with respect to the stationary support structure.

12. The combination of claim 8 in which the stationary support structurehas an opening therein and the connector means includes a stud which isaxially movable within the opening in the stationary support structure.

13. The combination of claim 8 in which the first rotary member has aperipheral groove therein and the connector means has a portion withinthe peripheral groove.

9 14. The combination of claim 13 in which the portion of the connectormeans which is within the peripheral groove of the first rotary memberis arcuate and extends around at least one-half the periphery of thefirst rotary member.

References Cited UNITED STATES PATENTS 10 8/1967 Van GolverdingeschutU.S. Cl. X.R.

